Modified rain attenuation model for tropical regions for Ku-Band signals

2006 ◽  
Vol 25 (1) ◽  
pp. 53-67 ◽  
Author(s):  
V. Ramachandran ◽  
V. Kumar
Keyword(s):  
Rain Attenuation ◽  
Tropical Regions ◽  
Attenuation Model ◽  
Ku Band

scholarly journals Characterization of concurrent ku band tropospheric scintillation and rain attenuation in Malaysia

2019 ◽  
Vol 15 (2) ◽  
pp. 956
Author(s):  
Ibtihal Fawzi Elshami ◽  
Jafri Din ◽  
Lam Hong Yin ◽  
Ali I Elgayar
Keyword(s):  
Communication Systems ◽  
Satellite Communication ◽  
Power Spectral Analysis ◽  
Rain Attenuation ◽  
Significant Information ◽  
Tropical Regions ◽  
Significant Impairment ◽  
One Year ◽  
Tropospheric Scintillation ◽  
Ku Band

<span>Tropospheric scintillation in satellite communication systems operating at frequencies over 10 GHz is a significant impairment, especially in tropical regions, as attenuation affects scintillation dramatically. This work concentrates on tropospheric scintillation in equatorial Johor Bahru, Malaysia, based on a one-year Ku-band propagation measurement study utilising a direct broadcast receiver and an automatic weather station. This study aimed to investigate the relationship between wet scintillation and rain attenuation using experimental measurements. The power spectral analysis has been carried out to determine required cut-off frequency of filtering to separate out rain attenuation and scintillation effects. The results can provide significant information on the fluctuations of wet scintillation at Ku-band earth space link in tropical regions.</span>

scholarly journals Analysis of rain fade slope for terrestrial links

2020 ◽  
Vol 18 (2) ◽  
pp. 896
Author(s):  
Jalel Chebil ◽  
Al-Hareth Zyoud ◽  
Mohamed Hadi Habaebi ◽  
Islam Md. Rafiqul ◽  
Hassan Dao
Keyword(s):  
Standard Deviation ◽  
Prediction Model ◽  
Rain Attenuation ◽  
Measured Data ◽  
Rate Of Change ◽  
Tropical Regions

<p><span>Rainfall can cause severe degradation to the operation of microwave links working with frequencies above 10 GHz. Many studies have investigated this problem, and one of the factors that attract the attention of researcher is rain fade slope which is the rate of change of rain attenuation.</span><span> The focus of this study is on rain fade slope for terrestrial links and it is </span><span>based on measurement conducted in Malaysia</span><span>.</span><span> This paper investigates the characteristics of the measured rain fade slope distribution </span><span>for various attenuation levels</span><span>. Then, </span><span>the ITU-R model for rain fade slope is compared with the corresponding statistics obtained from the measured data. Significant discrepancies have been observed since the ITU-R prediction model does not fit the measured fade slope distribution for many attenuation levels. It is recommended to modify the expression of the standard deviation in the ITU-R model when implemented in tropical regions.</span></p>

Rain attenuation of millimetre wave above 10 GHz for terrestrial links in tropical regions

2018 ◽  
Vol 29 (8) ◽  
pp. e3450 ◽  
Author(s):  
Ibraheem Shayea ◽  
Tharek Abd. Rahman ◽  
Marwan Hadri Azmi ◽  
Arsany Arsad
Keyword(s):  
Rain Attenuation ◽  
Millimetre Wave ◽  
Tropical Regions

Rain Rate and Rain Attenuation Over Millimeter Waves in Tropical Regions Based on Real Measurements

2021 ◽  
Author(s):  
Waheeb Tashan ◽  
Ibraheem Shayea ◽  
Sultan Aldirmaz-Colak ◽  
Tharek Abdul Rahman ◽  
Ayman A. El-Saleh ◽  
...  
Keyword(s):  
Millimeter Waves ◽  
Rain Rate ◽  
Rain Attenuation ◽  
Tropical Regions

Investigation of HAPs Propagation Channel for Wireless Access in a Tropical Region at Ka-Band

2017 ◽  
Vol 7 (3) ◽  
pp. 1204
Author(s):  
Felix Obite ◽  
Jafri Din ◽  
Kamaludin Mohammad Yusof ◽  
Basliza M. Noor
Keyword(s):  
Fading Channels ◽  
Channel Model ◽  
Rain Attenuation ◽  
Wireless Access ◽  
Rician Fading ◽  
Communication Link ◽  
Propagation Channel ◽  
Ka Band ◽  
Tropical Regions ◽  
Budget Analysis

<p>In the last few years, High Altitude Platforms (HAPs) have attracted considerable effort due to their ability to exploit the advantages of satellite and terrestrial-based systems. Rain attenuation is the most dominant atmospheric impairment, especially at such frequency band. This paper addresses the modelling of rain attenuation and describes a propagation channel model for HAPs at Ka-band to provide efficient and robust wireless access for tropical regions. The attenuation due to rain is modeled based on three years measured data for Johor Bahru to estimate the actual effect of rain on signals at Ka band. The radio propagation channel is usually characterized as a random multipath channel. Specifically, a statistical derivation of probability distribution function for Rayleigh and Rician fading channels are presented. The model consists of multiple path scattering effects, time dispersion, and Doppler shifts acting on the HAPs communication link. Simulation results represent the fading signal level variations. Results show perfect agreement between simulation and theoretical, thereby conforming to the multipath structures. The information obtained will be useful to system engineers for HAPs link budget analysis in order to obtain the required fade margin for optimal system performance in tropical regions.</p>

Analysis of Selected Earth-Space Rain Attenuation Models for a Tropical Station

2016 ◽  
Vol 3 (2) ◽  
pp. 383 ◽  
Author(s):  
A. I. O. Yussuff
Keyword(s):  
Prediction Models ◽  
Measurement Data ◽  
Daily Rainfall ◽  
Rain Attenuation ◽  
Propagation Path ◽  
Tropical Regions ◽  
Earth Space ◽  
Budget Analysis ◽  
Link Budget ◽  
Attenuation Models

The restrained use of millimeter bands is due to severe rain attenuation. Attenuation is caused when rain cells intersects radio wave’s propagation path; resulting in deep fades. The effect of rainfall is more severe in tropical regions characterized by heavy rainfall intensity and large raindrops; hence, rain attenuation analyses are essential to study rain fade characteristics for use in earth-space link budget analysis, for outage prediction resulting from rain attenuation. Tropical regions are particularly challenged with signal outage, necessitating the formulation and development of suitable prediction model(s) for the region. Therefore, extensive knowledge of the propagation phenomena mitigating system availability and signal quality in these bands are required. Daily rainfall data were collected from the Nigerian Meteorological Services for Lagos for spanning January to December 2010. Results showed that although, the ITU-R model out-performed the other prediction models under consideration, none of prediction models matched the measurement data.

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